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xfs: Fix rounding in xfs_alloc_fix_len() 

Rounding in xfs_alloc_fix_len() is wrong. As the comment states, the
result should be a number of a form (k*prod+mod) however due to sign
mistake the result is different. As a result allocations on raid arrays
could be misaligned in some cases.

This also seems to fix occasional assertion failure:
	XFS_WANT_CORRUPTED_GOTO(rlen <= flen, error0)
in xfs_alloc_ag_vextent_size().

Also add an assertion that the result of xfs_alloc_fix_len() is of
expected form.

Signed-off-by: Jan Kara <jack@suse.cz>
Reviewed-by: Brian Foster <bfoster@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>
This commit is contained in:
Jan Kara 2014-06-06 16:06:37 +10:00 committed by Dave Chinner
parent 448011e2ab
commit 30265117ee
1 changed files with 8 additions and 10 deletions
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18
fs/xfs/xfs_alloc.c
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@ -257,16 +257,14 @@ xfs_alloc_fix_len(
k = rlen % args->prod;
if (k == args->mod)
return;
if (k > args->mod) {
if ((int)(rlen = rlen - k - args->mod) < (int)args->minlen)
return;
} else {
if ((int)(rlen = rlen - args->prod - (args->mod - k)) <
(int)args->minlen)
return;
}
ASSERT(rlen >= args->minlen);
ASSERT(rlen <= args->maxlen);
if (k > args->mod)
rlen = rlen - (k - args->mod);
else
rlen = rlen - args->prod + (args->mod - k);
if ((int)rlen < (int)args->minlen)
return;
ASSERT(rlen >= args->minlen && rlen <= args->maxlen);
ASSERT(rlen % args->prod == args->mod);
args->len = rlen;
}